Electronic device

ABSTRACT

An electronic device includes an optical lens assembly. The optical lens assembly includes four lens elements which are, in order from an outer side to an inner side: a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element has negative refractive power. An outer-side surface of the first lens element is concave in a paraxial region thereof and has at least one convex critical point in an off-axis region thereof. The third lens element has positive refractive power. The fourth lens element has an inner-side surface being convex in a paraxial region thereof and having at least one concave critical point in an off-axis region thereof. The optical lens assembly has a total of four lens elements.

RELATED APPLICATIONS

This application is a continuation patent application of U.S.application Ser. No. 16/460,910, filed on Jul. 2, 2019, which claimspriority to Taiwan Application 108103845, filed on January 31, 2019,which is incorporated by reference herein in its entirety.

BACKGROUND Technical Field

The present disclosure relates to an electronic device, moreparticularly to an electronic device including an optical lens assembly.

Description of Related Art

With the ever advancing innovation of semiconductor manufacturingtechnology, the specifications of photographing modules provided withelectronic devices are becoming more diverse for various applications.For example, electronic devices equipped with image capturing unitsfeaturing a wide field of view are becoming more popular on the market.In addition, with the trend of compactness in electronic devices,modules in electronic devices are now characterized towardsmulti-functionality or integrated with modules featuring otherfunctions. For example, an image capturing module can also be utilizedas a signal receiving module. However, miniaturization becomes difficultfor a conventional wide-angle camera due to its long total track length,a small aperture, poor image quality or lens elements having largediameters.

SUMMARY

According to one aspect of the present disclosure, an electronic deviceincludes an optical lens assembly. The optical lens assembly includesfour lens elements, and the four lens elements are, in order from anouter side to an inner side, a first lens element, a second lenselement, a third lens element and a fourth lens element.

The first lens element has negative refractive power. An outer-sidesurface of the first lens element is concave in a paraxial regionthereof and has at least one convex critical point in an off-axis regionthereof. The third lens element has positive refractive power. Thefourth lens element has an inner-side surface being convex in a paraxialregion thereof and having at least one concave critical point in anoff-axis region thereof. The optical lens assembly has a total of fourlens elements.

When a central thickness of the first lens element is CT1, a centralthickness of the second lens element is CT2, an axial distance betweenthe first lens element and the second lens element is T12, an axialdistance between the second lens element and the third lens element isT23, and an axial distance between the third lens element and the fourthlens element is T34, the following conditions are satisfied:

CT1/CT2<0.75; and

1.75<T12/(T23+T34).

According to another aspect of the present disclosure, an electronicdevice includes an optical lens assembly. The optical lens assemblyincludes four lens elements, and the four lens elements are, in orderfrom an outer side to an inner side, a first lens element, a second lenselement, a third lens element and a fourth lens element.

The first lens element has negative refractive power. An outer-sidesurface of the first lens element is concave in a paraxial regionthereof and has at least one convex critical point in an off-axis regionthereof. The third lens element has positive refractive power. Thefourth lens element has an inner-side surface being convex in a paraxialregion thereof and having at least one concave critical point in anoff-axis region thereof. The optical lens assembly has a total of fourlens elements.

When a central thickness of the first lens element is CT1, a centralthickness of the second lens element is CT2, an axial distance betweenthe first lens element and the second lens element is T12, an axialdistance between the second lens element and the third lens element isT23, an axial distance between the third lens element and the fourthlens element is T34, a curvature radius of the outer-side surface of thefirst lens element is R1, and a curvature radius of an inner-sidesurface of the first lens element is R2, the following conditions aresatisfied:

CT1/CT2<0.75;

0.80<T12/(T23+T34); and

(R1+R2)/(R1−R2)<0.70.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be better understood by reading the followingdetailed description of the embodiments, with reference made to theaccompanying drawings as follows:

FIG. 1 is a schematic view of an optical lens assembly and an imagesensor of an electronic device according to the 1st embodiment of thepresent disclosure;

FIG. 2 shows spherical aberration curves, astigmatic field curves and adistortion curve of the optical lens assembly of the electronic deviceaccording to the 1st embodiment;

FIG. 3 is a schematic view of an optical lens assembly and an imagesensor of an electronic device according to the 2nd embodiment of thepresent disclosure;

FIG. 4 shows spherical aberration curves, astigmatic field curves and adistortion curve of the optical lens assembly of the electronic deviceaccording to the 2nd embodiment;

FIG. 5 is a schematic view of an optical lens assembly and an imagesensor of an electronic device according to the 3rd embodiment of thepresent disclosure;

FIG. 6 shows spherical aberration curves, astigmatic field curves and adistortion curve of the optical lens assembly of the electronic deviceaccording to the 3rd embodiment;

FIG. 7 is a schematic view of an optical lens assembly and an imagesensor of an electronic device according to the 4th embodiment of thepresent disclosure;

FIG. 8 shows spherical aberration curves, astigmatic field curves and adistortion curve of the optical lens assembly of the electronic deviceaccording to the 4th embodiment;

FIG. 9 is a schematic view of an optical lens assembly and an imagesensor of an electronic device according to the 5th embodiment of thepresent disclosure;

FIG. 10 shows spherical aberration curves, astigmatic field curves and adistortion curve of the optical lens assembly of the electronic deviceaccording to the 5th embodiment;

FIG. 11 is a schematic view of an optical lens assembly and an imagesensor of an electronic device according to the 6th embodiment of thepresent disclosure;

FIG. 12 shows spherical aberration curves, astigmatic field curves and adistortion curve of the optical lens assembly of the electronic deviceaccording to the 6th embodiment;

FIG. 13 is a schematic view of an optical lens assembly and an imagesensor of an electronic device according to the 7th embodiment of thepresent disclosure;

FIG. 14 shows spherical aberration curves, astigmatic field curves and adistortion curve of the optical lens assembly of the electronic deviceaccording to the 7th embodiment;

FIG. 15 is a schematic view of an optical lens assembly and an imagesensor of an electronic device according to the 8th embodiment of thepresent disclosure;

FIG. 16 shows spherical aberration curves, astigmatic field curves and adistortion curve of the optical lens assembly of the electronic deviceaccording to the 8th embodiment;

FIG. 17 is a perspective view of an optical lens assembly and an imagesensor of an electronic device according to the 9th embodiment of thepresent disclosure;

FIG. 18 shows spherical aberration curves, astigmatic field curves and adistortion curve of the optical lens assembly of the electronic deviceaccording to the 9th embodiment;

FIG. 19 is a perspective view of an optical lens assembly and an imagesensor of an electronic device according to the 10th embodiment of thepresent disclosure;

FIG. 20 shows spherical aberration curves, astigmatic field curves and adistortion curve of the optical lens assembly of the electronic deviceaccording to the 10th embodiment;

FIG. 21 is a perspective view of an electronic device according to the11th embodiment of the present disclosure;

FIG. 22 is a perspective view of an electronic device according to the12th embodiment of the present disclosure;

FIG. 23 is a perspective view of an electronic device according to the13th embodiment of the present disclosure; and

FIG. 24 shows a schematic view of Y11, Y42, Yc11, Yc42 and criticalpoints of the first lens element, the second lens element and the fourthlens element according to the 5th embodiment of the present disclosure.

DETAILED DESCRIPTION

An electronic device includes an optical lens assembly, and the opticallens assembly includes four lens elements. The four lens elements are,in order from an outer side to an inner side, a first lens element, asecond lens element, a third lens element and a fourth lens element.

The first lens element has negative refractive power, and an outer-sidesurface of the first lens element is concave in a paraxial regionthereof and has at least one convex critical point in an off-axis regionthereof. Therefore, it is favorable for reducing the effective radius ofthe first lens element, thereby obtaining a compact size of the opticallens assembly applicable to electronic devices having relatively limitedaccommodation space. Please refer to FIG. 24, which shows a schematicview of a convex critical point C of the outer-side surface 511 of thefirst lens element 510 according to the 5th embodiment of the presentdisclosure.

The second lens element can have positive refractive power, the secondlens element can have an outer-side surface being concave in a paraxialregion thereof and having at least one convex critical point in anoff-axis region thereof. Therefore, it is favorable for balancing therefractive power of the first lens element and correcting chromaticaberration. Please refer to FIG. 24, which shows a schematic view of aconvex critical point C of the outer-side surface 521 of the second lenselement 520 according to the 5th embodiment of the present disclosure.

The third lens element has positive refractive power. Therefore, it isfavorable for providing significant light converging capability so as tocontrol the size of the camera. The third lens element can have anouter-side surface being convex in a paraxial region thereof and aninner-side surface being convex in a paraxial region thereof. Therefore,it is favorable for effectively controlling an incident angle of lightrays on the image surface so as to ensure that the image surfacereceives sufficient amount of light, thereby increasing illuminance onthe peripheral region of the image surface and ensuring good quality ofperipheral image identification for various applications.

The fourth lens element has an inner-side surface being convex in aparaxial region thereof and having at least one concave critical pointin an off-axis region thereof. Therefore, it is favorable for the fourthlens element to collaborate with the third lens element having strongerpositive refractive power so as to prevent excessive correction ofaberrations. Please refer to FIG. 24, which shows a schematic view of aconcave critical point C of the inner-side surface 542 of the fourthlens element 540 according to the 5th embodiment of the presentdisclosure. When a central thickness of the first lens element is CT1,and a central thickness of the second lens element is CT2, the followingcondition is satisfied: CT1/CT2<0.75. Therefore, it is favorable forobtaining good space utilization, preventing the first lens element frombeing overly thick for ensuring the miniaturization of the optical lensassembly, and increasing the manufacturing feasibility of the first lenselement. Moreover, the following condition can also be satisfied:0.10<CT1/CT2<0.50.

When an axial distance between the first lens element and the secondlens element is T12, an axial distance between the second lens elementand the third lens element is T23, and an axial distance between thethird lens element and the fourth lens element is T34, the followingcondition is satisfied: 0.80<T12/(T23+T34). Therefore, it is favorablefor ensuring sufficient space between the first and second lenselements, and gathering light rays from a wide angle in the camera bythe first lens element so as to satisfy the requirement of a wide fieldof view. Moreover, the following condition can also be satisfied:1.75<T12/(T23+T34). Moreover, the following condition can also besatisfied: 1.50<T12/(T23+T34)<7.0. Moreover, the following condition canalso be satisfied: 2.0<T12/(T23+T34)<5.0.

When a curvature radius of the outer-side surface of the first lenselement is R1, and a curvature radius of an inner-side surface of thefirst lens element is R2, the following condition can be satisfied:(R1+R2)/(R1-R2)<0.70. Therefore, it is favorable for reducing theeffective radius of the first lens element, and thereby a configurationof the optical lens assembly featuring small size is applicable toelectronic devices having relatively limited accommodation space.Moreover, the following condition can also be satisfied:(R1+R2)/(R1−R2)<0.40. Moreover, the following condition can also besatisfied: −0.50<(R1+R2)/(R1−R2)<0.50.

When a curvature radius of an outer-side surface of the fourth lenselement is R7, a curvature radius of the inner-side surface of thefourth lens element is R8, and a focal length of the optical lensassembly is f, the following condition can be satisfied:−1.50<R7/f+R8/f<−0.30. Therefore, it is favorable for configuring thefourth lens element with the third lens element having stronger positiverefractive power so as to prevent excessive correction of aberrations.

When a maximum effective radius of the outer-side surface of the firstlens element is Y11, and a maximum effective radius of the inner-sidesurface of the fourth lens element is Y42, the following condition canbe satisfied: 1.0<Y42/Y11<2.0. Therefore, it is favorable for utilizingspace in the optical lens assembly by preventing one side of the barrelfrom being overly large, thereby favorable for reducing the size of theoptical lens assembly. Moreover, the following condition can also besatisfied: 1.20<Y42/Y11<1.70. Please refer to FIG. 24, which shows aschematic view of Y11 and Y42 according to the 5th embodiment of thepresent disclosure.

When a vertical distance between a critical point on the outer-sidesurface of the first lens element and an optical axis is Yc11, and thefocal length of the optical lens assembly is f, the following conditioncan be satisfied: 0.12<Yc11/f<0.50. Therefore, it is favorable forreducing the effective radius of the first lens element, therebyobtaining a compact size of the optical lens assembly applicable toelectronic devices with relatively limited accommodation space. Pleaserefer to FIG. 24, which shows a schematic view of Yc11 according to the5th embodiment of the present disclosure.

When a vertical distance between a critical point on the inner-sidesurface of the fourth lens element and the optical axis is Yc42, and thefocal length of the optical lens assembly is f, the following conditioncan be satisfied: 0.40<Yc42/f<1.0. Therefore, it is favorable for theconfiguration of the fourth lens element to correct the peripheralregions of an image. Please refer to FIG. 24, which shows a schematicview of Yc42 according to the 5th embodiment of the present disclosure.

When an Abbe number of the first lens element is V1, an Abbe number ofthe second lens element is V2, an Abbe number of the third lens elementis V3, an Abbe number of the fourth lens element is V4, an Abbe numberof the i-th lens element is Vi, a refractive index of the first lenselement is N1, a refractive index of the second lens element is N2, arefractive index of the third lens element is N3, a refractive index ofthe fourth lens element is N4, and a refractive index of the i-th lenselement is Ni, at least one lens element of the optical lens assemblycan satisfy the following condition: 8.0<Vi/Ni<12.0, wherein i=1, 2, 3or 4. Therefore, it is favorable for further correcting chromaticaberration. Moreover, the following condition can also be satisfied:8.0<V4/N4<12.0.

When a central thickness of the second lens element is CT2, and acentral thickness of the third lens element is CT3, the followingcondition can be satisfied: CT2/CT3<0.90. Therefore, it is favorable forpreventing the second lens element from being overly thick so as toensure good space utilization, thereby miniaturizing the optical lensassembly.

When the focal length of the optical lens assembly is f, and thecurvature radius of the outer-side surface of the first lens element isR1, the following condition can be satisfied: −1.0<f/R1<−0.20.Therefore, it is favorable for reducing the effective radius of thefirst lens element and thereby reducing the size of the optical lensassembly, so the optical lens assembly is applicable to electronicdevices having relatively limited accommodation space.

When the focal length of the optical lens assembly is f, and thecurvature radius of the inner-side surface of the fourth lens element isR8, the following condition can be satisfied: f/R8<−1.0. Therefore, itis favorable for configuring the fourth lens element with the third lenselement having stronger positive refractive power so as to preventovercorrecting aberrations.

When the central thickness of the first lens element is CT1, and theaxial distance between the first lens element and the second lenselement is T12, the following condition can be satisfied:0.50<CT1/T12<1.50. Therefore, it is favorable for providing sufficientspace between the first and second lens elements, and gathering lightrays from a wide angle in the camera by the first lens element so as tosatisfy the requirement of a wide field of view.

When an axial distance between the outer-side surface of the first lenselement and the inner-side surface of the fourth lens element is Td, andan axial distance between the inner-side surface of the fourth lenselement and an image surface is BL, the following condition can besatisfied: 2.20<Td/BL<5.0. Therefore, it is favorable for obtaining abalance between miniaturization and manufacturing feasibility of theoptical lens assembly.

According to the present disclosure, the aforementioned features andconditions can be utilized in numerous combinations so as to achievecorresponding effects.

According to the present disclosure, the lens elements of the opticallens assembly can be made of either glass or plastic material. When thelens elements are made of glass material, the refractive powerdistribution of the optical lens assembly may be more flexible. Theglass lens element can either be made by grinding or molding. When thelens elements are made of plastic material, the manufacturing cost canbe effectively reduced. Furthermore, surfaces of each lens element canbe arranged to be aspheric, which allows more control variables foreliminating aberrations thereof, the required number of the lenselements can be reduced, and the total track length of the optical lensassembly can be effectively shortened. The aspheric surfaces may beformed by plastic injection molding or glass molding.

According to the present disclosure, when a lens surface is aspheric, itmeans that the lens surface has an aspheric shape throughout itsoptically effective area, or a portion(s) thereof.

According to the present disclosure, one or more of the lens elements'material may optionally include an additive which alters the lenselements' transmittance in a specific range of wavelength for areduction in unwanted stray light or colour deviation. For example, theadditive may optionally filter out light in the wavelength range of 600nm to 800 nm to reduce excessive red light and/or near infrared light;or may optionally filter out light in the wavelength range of 350 nm to450 nm to reduce excessive blue light and/or near ultraviolet light frominterfering the final image. The additive may be homogeneously mixedwith a plastic material to be used in manufacturing a mixed-materiallens element by injection molding.

According to the present disclosure, each of an outer-side surface andan inner-side surface has a paraxial region and an off-axis region. Theparaxial region refers to the region of the surface where light raystravel close to the optical axis, and the off-axis region refers to theregion of the surface away from the paraxial region. Particularly,unless otherwise stated, when the lens element has a convex surface, itindicates that the surface is convex in the paraxial region thereof;when the lens element has a concave surface, it indicates that thesurface is concave in the paraxial region thereof. Moreover, when aregion of refractive power or focus of a lens element is not defined, itindicates that the region of refractive power or focus of the lenselement is in the paraxial region thereof.

According to the present disclosure, when the parameters of the opticallens assembly, image capturing unit, receiving device and electronicdevice are not specifically defined, these parameters may be determinedaccording to the operating wavelength range. For example, when theoperating wavelength range is a wavelength range of visible light (e.g.,350 nm to 750 nm), these parameters are defined at the wavelength ofhelium d-line; when the operating wavelength range is a wavelength rangeof near infrared light (e.g., 750 nm to 1600 nm), these parameters aredefined at the wavelength of 940 nm.

According to the present disclosure, a critical point is a non-axialpoint of the lens surface where its tangent is perpendicular to theoptical axis.

According to the present disclosure, an image surface of the opticallens assembly, based on the corresponding image sensor, can be flat orcurved, especially a curved surface being concave facing towards theouter side of the optical lens assembly.

According to the present disclosure, an image correction unit, such as afield flattener, can be optionally disposed between the lens elementclosest to the inner side of the optical lens assembly and the imagesurface for correction of aberrations such as field curvature. Theoptical properties of the image correction unit, such as curvature,thickness, index of refraction, position and surface shape (convex orconcave surface with spherical, aspheric, diffractive or Fresnel types),can be adjusted according to the design of an image capturing unit. Ingeneral, a preferable image correction unit is, for example, a thintransparent element having a concave outer-side surface and a planarinner-side surface, and the thin transparent element is disposed nearthe image surface.

According to the present disclosure, the optical lens assembly caninclude at least one stop, such as an aperture stop, a glare stop or afield stop. Said glare stop or said field stop is set for eliminatingthe stray light and thereby improving image quality thereof.

According to the present disclosure, an aperture stop can be configuredas a front stop or a middle stop. A front stop disposed between animaged object and the first lens element can provide a longer distancebetween an exit pupil of the optical lens assembly and the image surfaceto produce a telecentric effect, and thereby improves the image-sensingefficiency of an image sensor (for example, CCD or CMOS). A middle stopdisposed between the first lens element and the image surface isfavorable for enlarging the viewing angle of the optical lens assemblyand thereby provides a wider field of view for the same.

According to the present disclosure, the optical lens assembly caninclude an aperture control unit. The aperture control unit may be amechanical component or a light modulator, which can control the sizeand shape of the aperture through electricity or electrical signals. Themechanical component can include a movable member, such as a bladeassembly or a light baffle. The light modulator can include a shieldingelement, such as a filter, an electrochromic material or aliquid-crystal layer. The aperture control unit controls the amount ofincident light or exposure time to enhance the capability of imagequality adjustment. In addition, the aperture control unit can be theaperture stop of the present disclosure, which changes the f-number toobtain different image effects, such as the depth of field or lensspeed.

According to the present disclosure, said outer side indicates theoutside of an electronic device, and said inner side indicates theinside of the electronic device. As for the optical lens assemblyfeaturing light receiving function, the outer side of the optical lensassembly is an object side of the optical lens assembly, and the innerside of the optical lens assembly is an image side of the optical lensassembly. As for any lens element of the optical lens assembly featuringlight receiving function, an outer-side surface of the lens element is alens surface facing toward the object side, and an inner-side surface ofthe lens element is a lens surface facing toward the image side. As forthe optical lens assembly featuring light projecting function, the outerside of the optical lens assembly is a magnifying side of the opticallens assembly closer to a detected object, and the inner side of theoptical lens assembly is a reducing side of the optical lens assemblycloser to a light source. As for any lens element of the optical lensassembly featuring light projecting function, an outer-side surface(i.e., a light emitting surface) of the lens element is a lens surfacefacing toward the detected object, and an inner-side surface (i.e., alight receiving surface) of the lens element is a lens surface facingtoward the light source.

According to the above description of the present disclosure, thefollowing specific embodiments are provided for further explanation.

1st Embodiment

FIG. 1 is a schematic view of an optical lens assembly and an imagesensor of an electronic device according to the 1st embodiment of thepresent disclosure. FIG. 2 shows, in order from left to right, sphericalaberration curves, astigmatic field curves and a distortion curve of theimage capturing unit according to the 1st embodiment. In FIG. 1, theimage capturing unit includes the optical lens assembly (its referencenumeral is omitted) of the present disclosure and an image sensor 170.The optical lens assembly includes, in order from an outer side to aninner side, a first lens element 110, an aperture stop 100, a secondlens element 120, a stop 101, a third lens element 130, a fourth lenselement 140, an IR-cut filter 150 and an image surface 160. The opticallens assembly includes four lens elements (110, 120, 130 and 140) withno additional lens element disposed between each of the adjacent fourlens elements.

The first lens element 110 with negative refractive power has anouter-side surface 111 being concave in a paraxial region thereof and aninner-side surface 112 being concave in a paraxial region thereof. Thefirst lens element 110 is made of plastic material and has theouter-side surface 111 and the inner-side surface 112 being bothaspheric. The outer-side surface 111 of the first lens element 110 hasat least one convex critical point in an off-axis region thereof.

The second lens element 120 with positive refractive power has anouter-side surface 121 being convex in a paraxial region thereof and aninner-side surface 122 being convex in a paraxial region thereof. Thesecond lens element 120 is made of plastic material and has theouter-side surface 121 and the inner-side surface 122 being bothaspheric.

The third lens element 130 with positive refractive power has anouter-side surface 131 being convex in a paraxial region thereof and aninner-side surface 132 being convex in a paraxial region thereof. Thethird lens element 130 is made of plastic material and has theouter-side surface 131 and the inner-side surface 132 being bothaspheric.

The fourth lens element 140 with negative refractive power has anouter-side surface 141 being concave in a paraxial region thereof and aninner-side surface 142 being convex in a paraxial region thereof. Thefourth lens element 140 is made of plastic material and has theouter-side surface 141 and the inner-side surface 142 being bothaspheric. The inner-side surface 142 of the fourth lens element 140 hasat least one concave critical point in an off-axis region thereof.

The IR-cut filter 150 is made of glass material and located between thefourth lens element 140 and the image surface 160, and will not affectthe focal length of the optical lens assembly. The image sensor 170 isdisposed on or near the image surface 160 of the optical lens assembly.

The equation of the aspheric surface profiles of the aforementioned lenselements of the 1st embodiment is expressed as follows:

${{X(Y)} = {{\left( {Y^{2}/R} \right)/\left( {1 + {{sqrt}\left( {1 - {\left( {1 + k} \right) \times \left( {Y/R} \right)^{2}}} \right)}} \right)} + {\sum\limits_{i}^{\;}\;{({Ai}) \times \left( Y^{i} \right)}}}},$

where,

X is the relative distance between a point on the aspheric surfacespaced at a distance Y from an optical axis and the tangential plane atthe aspheric surface vertex on the optical axis;

Y is the vertical distance from the point on the aspheric surface to theoptical axis;

R is the curvature radius;

k is the conic coefficient; and

Ai is the i-th aspheric coefficient, and in the embodiments, i may be,but is not limited to, 4, 6, 8, 10, 12, 14, 16, 18 and 20.

In the optical lens assembly of the image capturing unit according tothe 1st embodiment, when a focal length of the optical lens assembly isf, an f-number of the optical lens assembly is Fno, and half of amaximum field of view of the optical lens assembly is HFOV, theseparameters have the following values: f=0.95 millimeters (mm), Fno=2.12,HFOV=51.0 degrees (deg.).

When an Abbe number of the first lens element 110 is V1, and arefractive index of the first lens element 110 is N1, the followingcondition is satisfied: V1/N1=36.30.

When an Abbe number of the second lens element 120 is V2, and arefractive index of the second lens element 120 is N2, the followingcondition is satisfied: V2/N2=36.26.

When an Abbe number of the third lens element 130 is V3, and arefractive index of the third lens element 130 is N3, the followingcondition is satisfied: V3/N3=36.26.

When an Abbe number of the fourth lens element 140 is V4, and arefractive index of the fourth lens element 140 is N4, the followingcondition is satisfied: V4/N4=10.91.

When a central thickness of the first lens element 110 is CT1, and anaxial distance between the first lens element 110 and the second lenselement 120 is T12, the following condition is satisfied: CT1/T12=0.93.In this embodiment, an axial distance between two adjacent lens elementsis an air gap in a paraxial region between the two adjacent lenselements.

When the central thickness of the first lens element 110 is CT1, and acentral thickness of the second lens element 120 is CT2, the followingcondition is satisfied: CT1/CT2=0.28.

When the axial distance between the first lens element 110 and thesecond lens element 120 is T12, an axial distance between the secondlens element 120 and the third lens element 130 is T23, and an axialdistance between the third lens element 130 and the fourth lens element140 is T34, the following condition is satisfied: T12/(T23+T34)=1.82.

When a central thickness of the second lens element 120 is CT2, and acentral thickness of the third lens element 130 is CT3, the followingcondition is satisfied: CT2/CT3=0.97.

When an axial distance between the outer-side surface 111 of the firstlens element 110 and the inner-side surface 142 of the fourth lenselement 140 is Td, and an axial distance between the inner-side surface142 of the fourth lens element 140 and the image surface 160 is BL, thefollowing condition is satisfied: Td/BL=2.76.

When a curvature radius of the outer-side surface 111 of the first lenselement 110 is R1, and curvature radius of the inner-side surface 112 ofthe first lens element 110 is R2, the following condition is satisfied:(R1+R2)/(R1−R2)=0.28.

When the focal length of the optical lens assembly is f, and thecurvature radius of the outer-side surface 111 of the first lens element110 is R1, the following condition is satisfied: f/R1=−0.48.

When the focal length of the optical lens assembly is f, and a curvatureradius of the inner-side surface 142 of the fourth lens element 140 isR8, the following condition is satisfied: f/R8=−1.49.

When a curvature radius of the outer-side surface 141 of the fourth lenselement 140 is R7, the curvature radius of the inner-side surface 142 ofthe fourth lens element 140 is R8, and the focal length of the opticallens assembly is f, the following condition is satisfied:R7/f+R8/f=−0.98.

When a maximum effective radius of the outer-side surface 111 of thefirst lens element 110 is Y11, and a maximum effective radius of theinner-side surface 142 of the fourth lens element 140 is Y42, thefollowing condition is satisfied: Y42/Y11=1.44.

When a vertical distance between the critical point on the outer-sidesurface 111 of the first lens element 110 and the optical axis is Yc11,and the focal length of the optical lens assembly is f, the followingcondition is satisfied: Yc11/f=0.24.

When a vertical distance between the critical point on the inner-sidesurface 142 of the fourth lens element 140 and the optical axis is Yc42,and the focal length of the optical lens assembly is f, the followingcondition is satisfied: Yc42/f=0.70.

The detailed optical data of the 1st embodiment are shown in Table 1 andthe aspheric surface data are shown in Table 2 below.

TABLE 1 1st Embodiment f = 0.95 mm, Fno = 2.12, HFOV = 51.0 deg. Sur-face Curvature Thick- Mate- Abbe Focal # Radius ness rial Index # Length0 Object Plano Infinity 1 Lens 1  −1.993 (ASP)  0.250 Plastic 1.545 56.1−1.28 2   1.115 (ASP)  0.173 3 Ape. Plano  0.095 Stop 4 Lens 2 100.000(ASP)  0.893 Plastic 1.544 56.0 2.02 5  −1.110 (ASP) −0.170 6 Stop Plano 0.238 7 Lens 3   1.129 (ASP)  0.921 Plastic 1.544 56.0 0.75 8  −0.453(ASP)  0.079 9 Lens 4  −0.295 (ASP)  0.354 Plastic 1.686 18.4 −1.37 10 −0.641 (ASP)  0.430 11 IR-Cut Plano  0.210 Glass 1.517 64.2 — Filter 12Plano  0.387 13 Image Plano  0.000 Note: Reference wavelength is 587.6nm (d-line). An effective radius of the stop 101 (Surface 6) is 0.608mm.

TABLE 2 Aspheric Coefficients Surface # 1 2 4 5 k = −9.9000E+01  0.0000E+00   0.0000E+00   0.0000E+00 A4 =   2.2199E+00   2.0717E+00  1.2472E+00 −9.8032E−01 A6 = −1.2865E+01   2.6251E+02 −3.5554E+01−3.7619E+00 A8 =   1.2228E+02 −9.4014E+03   1.6085E+03   1.1918E+02 A10= −1.0147E+03   1.6334E+05 −3.7260E+04 −1.1530E+03 A12 =   5.7517E+03−9.6169E+05   5.1465E+05   6.4893E+03 A14 = −2.0889E+04 −1.0249E+07−4.3305E+06 −2.2427E+04 A16 =   4.6781E+04   2.0113E+08   2.1455E+07  4.6614E+04 A18 = −5.9045E+04 −1.1731E+09 −5.6517E+07 −5.3283E+04 A20 =  3.2198E+04   2.3477E+09   5.9286E+07   2.5712E+04 Surface # 7 8 9 10 k= −2.1653E+01 −4.5877E+00 −2.5671E+00 −9.7258E−01 A4 =   5.1939E−01−1.1067E−01   9.0892E−01   1.8253E+00 A6 = −5.0350E+00   5.1103E−02−5.0875E+00 −2.9034E+00 A8 =   3.4323E+01 −1.9877E+01   1.7407E+01  3.1786E+00 A10 = −1.4719E+02   1.4709E+02 −2.9851E+01   1.5794E+01 A12=   4.1363E+02 −5.0078E+02   1.2763E+01 −9.8762E+01 A14 = −7.4943E+02  9.7503E+02   2.5298E+01   2.4063E+02 A16 =   8.2273E+02 −1.1311E+03−2.4475E+01 −3.0885E+02 A18 = −4.8272E+02   7.3649E+02 −2.7744E+00  2.0646E+02 A20 =   1.1030E+02 −2.0824E+02   6.0458E+00 −5.6698E+01

In Table 1, the curvature radius, the thickness and the focal length areshown in millimeters (mm). Surface numbers 0-13 represent the surfacessequentially arranged from the outer side to the inner side along theoptical axis. In Table 2, k represents the conic coefficient of theequation of the aspheric surface profiles. A4-20 represent the asphericcoefficients ranging from the 4th order to the 20th order. The tablespresented below for each embodiment are the corresponding schematicparameter and aberration curves, and the definitions of the tables arethe same as Table 1 and Table 2 of the 1st embodiment. Therefore, anexplanation in this regard will not be provided again.

2nd Embodiment

FIG. 3 is a schematic view of an optical lens assembly and an imagesensor of an electronic device according to the 2nd embodiment of thepresent disclosure. FIG. 4 shows, in order from left to right, sphericalaberration curves, astigmatic field curves and a distortion curve of theimage capturing unit according to the 2nd embodiment. In FIG. 3, theimage capturing unit includes the optical lens assembly (its referencenumeral is omitted) of the present disclosure and an image sensor 270.The optical lens assembly includes, in order from an outer side to aninner side, a first lens element 210, an aperture stop 200, a secondlens element 220, a stop 201, a third lens element 230, a fourth lenselement 240, an IR-cut filter 250 and an image surface 260. The opticallens assembly includes four lens elements (210, 220, 230 and 240) withno additional lens element disposed between each of the adjacent fourlens elements.

The first lens element 210 with negative refractive power has anouter-side surface 211 being concave in a paraxial region thereof and aninner-side surface 212 being concave in a paraxial region thereof. Thefirst lens element 210 is made of plastic material and has theouter-side surface 211 and the inner-side surface 212 being bothaspheric. The outer-side surface 211 of the first lens element 210 hasat least one convex critical point in an off-axis region thereof.

The second lens element 220 with negative refractive power has anouter-side surface 221 being concave in a paraxial region thereof and aninner-side surface 222 being convex in a paraxial region thereof. Thesecond lens element 220 is made of plastic material and has theouter-side surface 221 and the inner-side surface 222 being bothaspheric.

The third lens element 230 with positive refractive power has anouter-side surface 231 being convex in a paraxial region thereof and aninner-side surface 232 being convex in a paraxial region thereof. Thethird lens element 230 is made of plastic material and has theouter-side surface 231 and the inner-side surface 232 being bothaspheric.

The fourth lens element 240 with negative refractive power has anouter-side surface 241 being concave in a paraxial region thereof and aninner-side surface 242 being convex in a paraxial region thereof. Thefourth lens element 240 is made of plastic material and has theouter-side surface 241 and the inner-side surface 242 being bothaspheric. The inner-side surface 242 of the fourth lens element 240 hasat least one concave critical point in an off-axis region thereof.

The IR-cut filter 250 is made of glass material and located between thefourth lens element 240 and the image surface 260, and will not affectthe focal length of the optical lens assembly. The image sensor 270 isdisposed on or near the image surface 260 of the optical lens assembly.

The detailed optical data of the 2nd embodiment are shown in Table 3 andthe aspheric surface data are shown in Table 4 below.

TABLE 3 2nd Embodiment f = 1.05 mm, Fno = 2.12, HFOV = 47.5 deg. Sur-face Curvature Thick- Mate- Abbe Focal # Radius ness rial Index # Length0 Object Plano Infinity 1 Lens 1 −40.523 (ASP)  0.294 Plastic 1.544 56.0−1.86 2   1.039 (ASP)  0.201 3 Ape. Plano  0.147 Stop 4 Lens 2  −1.516(ASP)  0.542 Plastic 1.550 53.0 −34.84 5  −1.855 (ASP) −0.012 6 StopPlano  0.118 7 Lens 3   0.734 (ASP)  1.183 Plastic 1.544 56.0 0.78 8 −0.432 (ASP)  0.076 9 Lens 4  −0.283 (ASP)  0.250 Plastic 1.686 18.4−1.34 10  −0.556 (ASP)  0.430 11 IR-Cut Plano  0.210 Glass 1.517 64.2 —Filter 12 Plano  0.449 13 Image Plano  0.000 Note: Reference wavelengthis 587.6 nm (d-line). An effective radius of the stop 201 (Surface 6) is0.608 mm.

TABLE 4 Aspheric Coefficients Surface # 1 2 4 5 k = −9.9000E+01  0.0000E+00   0.0000E+00   0.0000E+00 A4 =   1.5453E+00   3.4550E+00  6.8345E−02 −2.5986E+00 A6 = −6.4838E+00 −5.4939E+01   1.5537E+01  1.7034E+01 A8 =   4.9635E+01   3.1992E+03 −6.2151E+02 −1.1548E+02 A10= −3.4513E+02 −1.0104E+05   1.6921E+04   6.5580E+02 A12 =   1.7558E+03  1.8786E+06 −2.8510E+05 −3.0472E+03 A14 = −5.9046E+03 −2.0746E+07  3.0024E+06   1.0901E+04 A16 =   1.2338E+04   1.3339E+08 −1.9252E+07−2.6827E+04 A18 = −1.4411E+04 −4.5518E+08   6.8572E+07   3.8979E+04 A20=   7.1588E+03   6.2896E+08 −1.0408E+08 −2.5032E+04 Surface # 7 8 9 10 k= −9.7192E+00 −4.1140E+00 −2.5207E+00 −1.1411E+00 A4 =   4.7729E−01−6.3383E−01   1.4811E−01   2.2202E+00 A6 = −2.0910E+00   2.3988E+00  1.0331E+00 −6.2857E+00 A8 =   1.0218E+01 −1.4979E+01 −7.2017E+00  2.2989E+01 A10 = −3.7599E+01   7.3121E+01   3.6207E+01 −6.3502E+01 A12=   9.1515E+01 −2.1516E+02 −1.2578E+02   1.1651E+02 A14 = −1.3933E+02  3.7948E+02   2.7166E+02 −1.3646E+02 A16 =   1.2706E+02 −3.8815E+02−3.4121E+02   9.5037E+01 A18 = −6.2966E+01   2.0981E+02   2.2682E+02−3.3967E+01 A20 =   1.2764E+01 −4.5954E+01 −6.1648E+01   4.2355E+00

In the 2nd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 2nd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 3 and Table 4 asthe following values and satisfy the following conditions:

2nd Embodiment f [mm] 1.05 CT2/CT3 0.46 Fno 2.12 Td/BL 2.57 HFOV [deg.]47.5 (R1 + R2)/(R1 − R2) 0.95 V1/N1 36.26 f/R1 −0.03 V2/N2 34.19 f/R8−1.88 V3/N3 36.26 R7/f + R8/f −0.80 V4/N4 10.91 Y42/Y11 1.32 CT1/T120.84 Yc11/f 0.06 CT1/CT2 0.54 Yc42/f 0.61 T12/(T23 + T34) 1.91 — —

3rd Embodiment

FIG. 5 is a schematic view of an optical lens assembly and an imagesensor of an electronic device according to the 3rd embodiment of thepresent disclosure. FIG. 6 shows, in order from left to right, sphericalaberration curves, astigmatic field curves and a distortion curve of theimage capturing unit according to the 3rd embodiment. In FIG. 5, theimage capturing unit includes the optical lens assembly (its referencenumeral is omitted) of the present disclosure and an image sensor 370.The optical lens assembly includes, in order from an outer side to aninner side, a first lens element 310, an aperture stop 300, a secondlens element 320, a stop 301, a third lens element 330, a fourth lenselement 340, an IR-cut filter 350 and an image surface 360. The opticallens assembly includes four lens elements (310, 320, 330 and 340) withno additional lens element disposed between each of the adjacent fourlens elements.

The first lens element 310 with negative refractive power has anouter-side surface 311 being concave in a paraxial region thereof and aninner-side surface 312 being concave in a paraxial region thereof. Thefirst lens element 310 is made of plastic material and has theouter-side surface 311 and the inner-side surface 312 being bothaspheric. The outer-side surface 311 of the first lens element 310 hasat least one convex critical point in an off-axis region thereof.

The second lens element 320 with negative refractive power has anouter-side surface 321 being concave in a paraxial region thereof and aninner-side surface 322 being convex in a paraxial region thereof. Thesecond lens element 320 is made of plastic material and has theouter-side surface 321 and the inner-side surface 322 being bothaspheric.

The third lens element 330 with positive refractive power has anouter-side surface 331 being convex in a paraxial region thereof and aninner-side surface 332 being convex in a paraxial region thereof. Thethird lens element 330 is made of plastic material and has theouter-side surface 331 and the inner-side surface 332 being bothaspheric.

The fourth lens element 340 with negative refractive power has anouter-side surface 341 being concave in a paraxial region thereof and aninner-side surface 342 being convex in a paraxial region thereof. Thefourth lens element 340 is made of plastic material and has theouter-side surface 341 and the inner-side surface 342 being bothaspheric. The inner-side surface 342 of the fourth lens element 340 hasat least one concave critical point in an off-axis region thereof.

The IR-cut filter 350 is made of glass material and located between thefourth lens element 340 and the image surface 360, and will not affectthe focal length of the optical lens assembly. The image sensor 370 isdisposed on or near the image surface 360 of the optical lens assembly.

The detailed optical data of the 3rd embodiment are shown in Table 5 andthe aspheric surface data are shown in Table 6 below.

TABLE 5 3rd Embodiment f = 1.08 mm, Fno = 1.80, HFOV = 47.5 deg. Sur-face Curvature Thick- Mate- Abbe Focal # Radius ness rial Index # Length0 Object Plano Infinity 1 Lens 1 −4.558 (ASP) 0.252 Plastic 1.544 55.9−1.86 2  1.323 (ASP) 0.211 3 Ape. Plano 0.189 Stop 4 Lens 2 −1.285 (ASP)0.462 Plastic 1.544 55.9 −47.60 5 −1.523 (ASP) 0.008 6 Stop Plano 0.1397 Lens 3  0.734 (ASP) 1.137 Plastic 1.544 55.9 0.80 8 −0.488 (ASP) 0.0759 Lens 4 −0.311 (ASP) 0.250 Plastic 1.686 18.4 −1.41 10 −0.609 (ASP)0.430 11 IR-Cut Plano 0.210 Glass 1.517 64.2 — Filter 12 Plano 0.522 13Image Plano 0.000 Note: Reference wavelength is 587.6 nm (d-line). Aneffective radius of the stop 301 (Surface 6) is 0.608 mm.

TABLE 6 Aspheric Coefficients Surface # 1 2 4 5 k =   1.3620E+01  0.0000E+00   0.0000E+00   0.0000E+00 A4 =   1.9094E+00   2.1577E+00−3.0374E−01 −2.1792E+00 A6 = −8.8997E+00   4.5063E+01   3.3218E+00  3.6854E+00 A8 =   6.6353E+01 −1.5347E+03 −1.3304E+02   9.1385E+01 A10= −4.2811E+02   3.0562E+04   2.8676E+03 −1.6484E+03 A12 =   1.9290E+03−3.8177E+05 −4.1311E+04   1.3509E+04 A14 = −5.5627E+03   3.0709E+06  3.7402E+05 −6.4315E+04 A16 =   9.6952E+03 −1.5281E+07 −2.0483E+06  1.8081E+05 A18 = −9.2168E+03   4.2755E+07   6.2177E+06 −2.7856E+05 A20=   3.6300E+03 −5.1128E+07 −8.0669E+06   1.8131E+05 Surface # 7 8 9 10 k= −1.0340E+01 −6.3167E+00 −2.6175E+00 −1.1672E+00 A4 =   1.0209E+00−2.1911E+00   1.2995E−01   2.0493E+00 A6 = −7.7973E+00   2.5205E+01  8.7626E+00 −4.2529E+00 A8 =   4.5118E+01 −1.8787E+02 −9.1224E+01  9.2188E+00 A10 = −1.8620E+02   8.4945E+02   4.7853E+02 −1.1944E+01 A12=   5.2096E+02 −2.4067E+03 −1.4862E+03   1.2120E+01 A14 = −9.5562E+02  4.3212E+03   2.8558E+03 −2.8694E+01 A16 =   1.0953E+03 −4.7873E+03−3.3608E+03   5.2739E+01 A18 = −7.0767E+02   2.9903E+03   2.2344E+03−4.3331E+01 A20 =   1.9605E+02 −8.0563E+02 −6.4575E+02   1.2614E+01

In the 3rd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 3rd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 5 and Table 6 asthe following values and satisfy the following conditions:

3rd Embodiment f [mm] 1.08 CT2/CT3 0.41 Fno 1.80 Td/BL 2.34 HFOV [deg.]47.5 (R1 + R2)/(R1 − R2) 0.55 V1/N1 36.23 f/R1 −0.24 V2/N2 36.23 f/R8−1.77 V3/N3 36.23 R7/f + R8/f −0.86 V4/N4 10.91 Y42/Y11 1.24 CT1/T120.63 Yc11/f 0.18 CT1/CT2 0.55 Yc42/f 0.55 T12/(T23 + T34) 1.80 — —

4th Embodiment

FIG. 7 is a schematic view of an optical lens assembly and an imagesensor of an electronic device according to the 4th embodiment of thepresent disclosure. FIG. 8 shows, in order from left to right, sphericalaberration curves, astigmatic field curves and a distortion curve of theimage capturing unit according to the 4th embodiment. In FIG. 7, theimage capturing unit includes the optical lens assembly (its referencenumeral is omitted) of the present disclosure and an image sensor 470.The optical lens assembly includes, in order from an outer side to aninner side, a first lens element 410, an aperture stop 400, a secondlens element 420, a stop 401, a third lens element 430, a fourth lenselement 440, an IR-cut filter 450 and an image surface 460. The opticallens assembly includes four lens elements (410, 420, 430 and 440) withno additional lens element disposed between each of the adjacent fourlens elements.

The first lens element 410 with negative refractive power has anouter-side surface 411 being concave in a paraxial region thereof and aninner-side surface 412 being concave in a paraxial region thereof. Thefirst lens element 410 is made of plastic material and has theouter-side surface 411 and the inner-side surface 412 being bothaspheric. The outer-side surface 411 of the first lens element 410 hasat least one convex critical point in an off-axis region thereof.

The second lens element 420 with positive refractive power has anouter-side surface 421 being concave in a paraxial region thereof and aninner-side surface 422 being convex in a paraxial region thereof. Thesecond lens element 420 is made of plastic material and has theouter-side surface 421 and the inner-side surface 422 being bothaspheric. The outer-side surface 421 of the second lens element 420 hasat least one convex critical point in an off-axis region thereof.

The third lens element 430 with positive refractive power has anouter-side surface 431 being convex in a paraxial region thereof and aninner-side surface 432 being convex in a paraxial region thereof. Thethird lens element 430 is made of plastic material and has theouter-side surface 431 and the inner-side surface 432 being bothaspheric.

The fourth lens element 440 with negative refractive power has anouter-side surface 441 being concave in a paraxial region thereof and aninner-side surface 442 being convex in a paraxial region thereof. Thefourth lens element 440 is made of plastic material and has theouter-side surface 441 and the inner-side surface 442 being bothaspheric. The inner-side surface 442 of the fourth lens element 440 hasat least one concave critical point in an off-axis region thereof.

The IR-cut filter 450 is made of glass material and located between thefourth lens element 440 and the image surface 460, and will not affectthe focal length of the optical lens assembly. The image sensor 470 isdisposed on or near the image surface 460 of the optical lens assembly.

The detailed optical data of the 4th embodiment are shown in Table 7 andthe aspheric surface data are shown in Table 8 below.

TABLE 7 4th Embodiment f = 0.95 mm, Fno = 2.04, HFOV = 51.0 deg. Sur-face Curvature Thick- Mate- Abbe Focal # Radius ness rial Index # Length0 Object Plano 400.000 1 Lens 1 −1.604 (ASP)   0.250 Plastic 1.545 56.1−1.60 2  2.023 (ASP)   0.179 3 Ape. Plano   0.102 Stop 4 Lens 2 −3.997(ASP)   0.799 Plastic 1.544 56.0 2.63 5 −1.127 (ASP)   0.171 6 StopPlano  −0.141 7 Lens 3  1.132 (ASP)   1.005 Plastic 1.544 56.0 0.70 8−0.396 (ASP)   0.067 9 Lens 4 −0.293 (ASP)   0.458 Plastic 1.669 19.4−1.50 10 −0.673 (ASP)   0.430 11 IR-Cut Plano   0.210 Glass 1.517 64.2 —Filter 12 Plano   0.332 13 Image Plano   0.000 Note: Referencewavelength is 587.6 nm (d-line). An effective radius of the stop 401(Surface 6) is 0.757 mm.

TABLE 8 Aspheric Coefficients Surface # 1 2 4 5 k= −7.2036E+01  0.0000E+00   0.0000E+00   0.0000E+00 A4=   1.6660E+00   3.3538E+00  8.9410E−01 −1.5952E+00 A6= −2.6705E+00   1.7269E+02   7.9603E+00  1.3025E+01 A8= −3.2417E+00 −7.2854E+03 −5.2243E+01 −5.7998E+01 A10=  4.2689E+01   1.6674E+05   9.8370E+01   1.4802E+02 A12= −1.0578E+02−2.2047E+06 — −1.9252E+02 A14=   8.6563E+01   1.6813E+07 —   9.9050E+01A16= — −6.6944E+07 — — A18= —   1.0553E+08 — — Surface # 7 8 9 10 k=−2.5796E+01 −3.3947E+00 −2.3994E+00 −9.1149E−01 A4=   2.7747E−01  1.8644E−01   6.8011E−01   1.2383E+00 A6=   2.4967E+00 −8.6527E+00−9.6345E+00 −8.5001E−01 A8= −2.0586E+01   6.4430E+01   7.7312E+01−4.2918E+00 A10=   7.9577E+01 −2.4710E+02 −3.3227E+02   4.2061E+01 A12=−1.8745E+02   5.4857E+02   8.4410E+02 −1.5868E+02 A14=   2.6518E+02−7.1202E+02 −1.3147E+03   3.2621E+02 A16= −2.0454E+02   5.0230E+02  1.2366E+03 −3.8418E+02 A18=   6.5779E+01 −1.4812E+02 −6.4368E+02  2.4303E+02 A20= — —   1.4181E+02 −6.3874E+01

In the 4th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 4th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 7 and Table 8 asthe following values and satisfy the following conditions:

4th Embodiment f [mm] 0.95 CT2/CT3 0.80 Fno 2.04 Td/BL 2.97 HFOV [deg.]51.0 (R1 + R2)/(R1 − R2) −0.12 V1/N1 36.30 f/R1 −0.59 V2/N2 36.26 f/R8−1.41 V3/N3 36.26 R7/f + R8/f −1.02 V4/N4 11.65 Y42/Y11 1.44 CT1/T120.89 Yc11/f 0.27 CT1/CT2 0.31 Yc42/f 0.72 T12/(T23 + T34) 2.90 — —

5th Embodiment

FIG. 9 is a schematic view of an optical lens assembly and an imagesensor of an electronic device according to the 5th embodiment of thepresent disclosure. FIG. 10 shows, in order from left to right,spherical aberration curves, astigmatic field curves and a distortioncurve of the image capturing unit according to the 5th embodiment. InFIG. 9, the image capturing unit includes the optical lens assembly (itsreference numeral is omitted) of the present disclosure and an imagesensor 570. The optical lens assembly includes, in order from an outerside to an inner side, a first lens element 510, an aperture stop 500, asecond lens element 520, a third lens element 530, a fourth lens element540, an IR-cut filter 550 and an image surface 560. The optical lensassembly includes four lens elements (510, 520, 530 and 540) with noadditional lens element disposed between each of the adjacent four lenselements.

The first lens element 510 with negative refractive power has anouter-side surface 511 being concave in a paraxial region thereof and aninner-side surface 512 being concave in a paraxial region thereof. Thefirst lens element 510 is made of plastic material and has theouter-side surface 511 and the inner-side surface 512 being bothaspheric. The outer-side surface 511 of the first lens element 510 hasat least one convex critical point in an off-axis region thereof.

The second lens element 520 with positive refractive power has anouter-side surface 521 being concave in a paraxial region thereof and aninner-side surface 522 being convex in a paraxial region thereof. Thesecond lens element 520 is made of plastic material and has theouter-side surface 521 and the inner-side surface 522 being bothaspheric. The outer-side surface 521 of the second lens element 520 hasat least one convex critical point in an off-axis region thereof.

The third lens element 530 with positive refractive power has anouter-side surface 531 being convex in a paraxial region thereof and aninner-side surface 532 being convex in a paraxial region thereof. Thethird lens element 530 is made of plastic material and has theouter-side surface 531 and the inner-side surface 532 being bothaspheric.

The fourth lens element 540 with negative refractive power has anouter-side surface 541 being concave in a paraxial region thereof and aninner-side surface 542 being convex in a paraxial region thereof. Thefourth lens element 540 is made of plastic material and has theouter-side surface 541 and the inner-side surface 542 being bothaspheric. The inner-side surface 542 of the fourth lens element 540 hasat least one concave critical point in an off-axis region thereof.

The IR-cut filter 550 is made of glass material and located between thefourth lens element 540 and the image surface 560, and will not affectthe focal length of the optical lens assembly. The image sensor 570 isdisposed on or near the image surface 560 of the optical lens assembly.

The detailed optical data of the 5th embodiment are shown in Table 9 andthe aspheric surface data are shown in Table 10 below.

TABLE 9 5th Embodiment f = 0.96 mm, Fno = 2.04, HFOV = 51.0 deg. Sur-face Curvature Thick- Mate- Abbe Focal # Radius ness rial Index # Length0 Object Plano 400.000 1 Lens 1 −2.172 (ASP)   0.250 Plastic 1.545 56.1−1.40 2  1.221 (ASP)   0.180 3 Ape. Plano   0.095 Stop 4 Lens 2 −5.281(ASP)   0.838 Plastic 1.544 56.0 2.35 5 −1.088 (ASP)   0.030 6 Lens 3 1.200 (ASP)   1.008 Plastic 1.544 56.0 0.73 7 −0.421 (ASP)   0.074 8Lens 4 −0.300 (ASP)   0.357 Plastic 1.669 19.4 −1.32 9 −0.673 (ASP)  0.430 10 IR-Cut Plano   0.210 Glass 1.517 64.2 — Filter 11 Plano  0.393 12 Image Plano   0.000 Note: Reference wavelength is 587.6 nm(d-line).

TABLE 10 Aspheric Coefficients Surface # 1 2 4 5 k= −9.9000E+01  0.0000E+00   0.0000E+00   0.0000E+00 A4=   2.2278E+00 −1.5614E+00  7.4140E−01 −1.0120E+00 A6= −1.1346E+01   5.5269E+02   7.7492E+00  6.2422E+00 A8=   7.7001E+01 −2.3588E+04 −4.2029E+01 −2.6803E+01 A10=−3.9937E+02   5.7614E+05   6.6424E+01   6.8645E+01 A12=   1.2899E+03−8.3080E+06 — −8.2300E+01 A14= −2.2300E+03   6.9689E+07 —   3.7724E+01A16=   1.5540E+03 −3.1086E+08 — — A18= —   5.6452E+08 — — Surface # 6 78 9 k= −3.2236E+01 −4.7117E+00 −2.4259E+00 −9.1682E−01 A4=   9.2499E−01−2.0957E+00 −8.1548E−01   1.1386E+00 A6= −4.6914E+00   1.7385E+01  1.2564E+01 −2.2953E−01 A8=   2.0332E+01 −8.4218E+01 −6.5207E+01  1.6635E+00 A10= −6.8215E+01   2.3425E+02   1.7802E+02 −1.4043E+01 A12=  1.5016E+02 −3.8508E+02 −2.6508E+02   4.4274E+01 A14= −2.0122E+02  3.6794E+02   1.8932E+02 −7.1367E+01 A16=   1.5121E+02 −1.8574E+02−1.1204E+01   5.7783E+01 A18= −4.9470E+01   3.7484E+01 −6.3391E+01−1.9066E+01 A20= — —   2.6103E+01   5.5543E−01

In the 5th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 5th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 9 and Table 10as the following values and satisfy the following conditions:

5th Embodiment f [mm] 0.96 CT2/CT3 0.83 Fno 2.04 Td/BL 2.74 HFOV [deg.]51.0 (R1 + R2)/(R1 − R2) 0.28 V1/N1 36.30 f/R1 −0.44 V2/N2 36.26 f/R8−1.42 V3/N3 36.26 R7/f + R8/f −1.02 V4/N4 11.65 Y42/Y11 1.51 CT1/T120.91 Yc11/f 0.23 CT1/CT2 0.30 Yc42/f 0.68 T12/(T23 + T34) 2.64 — —

6th Embodiment

FIG. 11 is a schematic view of an optical lens assembly and an imagesensor of an electronic device according to the 6th embodiment of thepresent disclosure. FIG. 12 shows, in order from left to right,spherical aberration curves, astigmatic field curves and a distortioncurve of the image capturing unit according to the 6th embodiment. InFIG. 11, the image capturing unit includes the optical lens assembly(its reference numeral is omitted) of the present disclosure and animage sensor 670. The optical lens assembly includes, in order from anouter side to an inner side, a first lens element 610, an aperture stop600, a second lens element 620, a stop 601, a third lens element 630, afourth lens element 640, an IR-cut filter 650 and an image surface 660.The optical lens assembly includes four lens elements (610, 620, 630 and640) with no additional lens element disposed between each of theadjacent four lens elements.

The first lens element 610 with negative refractive power has anouter-side surface 611 being concave in a paraxial region thereof and aninner-side surface 612 being concave in a paraxial region thereof. Thefirst lens element 610 is made of plastic material and has theouter-side surface 611 and the inner-side surface 612 being bothaspheric. The outer-side surface 611 of the first lens element 610 hasat least one convex critical point in an off-axis region thereof.

The second lens element 620 with positive refractive power has anouter-side surface 621 being concave in a paraxial region thereof and aninner-side surface 622 being convex in a paraxial region thereof. Thesecond lens element 620 is made of plastic material and has theouter-side surface 621 and the inner-side surface 622 being bothaspheric. The outer-side surface 621 of the second lens element 620 hasat least one convex critical point in an off-axis region thereof.

The third lens element 630 with positive refractive power has anouter-side surface 631 being convex in a paraxial region thereof and aninner-side surface 632 being convex in a paraxial region thereof. Thethird lens element 630 is made of plastic material and has theouter-side surface 631 and the inner-side surface 632 being bothaspheric.

The fourth lens element 640 with negative refractive power has anouter-side surface 641 being concave in a paraxial region thereof and aninner-side surface 642 being convex in a paraxial region thereof. Thefourth lens element 640 is made of plastic material and has theouter-side surface 641 and the inner-side surface 642 being bothaspheric. The inner-side surface 642 of the fourth lens element 640 hasat least one concave critical point in an off-axis region thereof.

The IR-cut filter 650 is made of glass material and located between thefourth lens element 640 and the image surface 660, and will not affectthe focal length of the optical lens assembly. The image sensor 670 isdisposed on or near the image surface 660 of the optical lens assembly.

The detailed optical data of the 6th embodiment are shown in Table 11and the aspheric surface data are shown in Table 12 below.

TABLE 11 6th Embodiment f = 0.95 mm, Fno = 2.04, HFOV = 51.0 deg. Sur-face Curvature Thick- Mate- Abbe Focal # Radius ness rial Index # Length0 Object Plano 400.000 1 Lens 1 −3.007 (ASP)   0.254 Plastic 1.545 56.1−1.52 2  1.179 (ASP)   0.207 3 Ape. Plano   0.107 Stop 4 Lens 2 −3.655(ASP)   0.814 Plastic 1.544 56.0 2.07 5 −0.927 (ASP)   0.200 6 StopPlano  −0.170 7 Lens 3  1.396 (ASP)   1.008 Plastic 1.544 56.0 0.76 8−0.435 (ASP)   0.070 9 Lens 4 −0.316 (ASP)   0.387 Plastic 1.669 19.4−1.43 10 −0.704 (ASP)   0.430 11 IR-Cut Plano   0.210 Glass 1.517 64.2 —Filter 12 Plano   0.367 13 Image Plano   0.000 Note: Referencewavelength is 587.6 nm (d-line). An effective radius of the stop 601(Surface 6) is 0.831 mm.

TABLE 12 Aspheric Coefficients Surface # 1 2 4 5 k= −1.1705E+00  0.0000E+00   0.0000E+00   0.0000E+00 A4=   2.9678E+00   2.6156E+00  7.3589E−01 −6.3194E−01 A6= −1.6485E+01   2.0574E+02   1.9551E+00  5.1275E+00 A8=   1.0267E+02 −9.6418E+03   2.3081E+00 −2.1236E+01 A10=−4.6809E+02   2.4694E+05 −3.1195E+01   4.3079E+01 A12=   1.3561E+03−3.6417E+06 — −3.1132E+01 A14= −2.1581E+03   3.0824E+07 —   3.0159E+00A16=   1.4061E+03 −1.3702E+08 — — A18= —   2.4485E+08 — — Surface # 7 89 10 k= −3.0211E+01 −4.9961E+00 −2.4349E+00 −8.6964E−01 A4=   5.3831E−01−2.1406E+00 −3.4146E−01   1.1171E+00 A6=   3.5417E−01   1.7583E+01  7.8338E+00   3.3040E−01 A8= −1.1617E+01 −8.4809E+01 −4.2327E+01−6.0965E+00 A10=   5.3037E+01   2.3971E+02   1.1589E+02   2.7017E+01A12= −1.3450E+02 −4.0758E+02 −1.6913E+02 −7.4845E+01 A14=   1.9797E+02  4.0817E+02   1.1183E+02   1.3663E+02 A16= −1.5340E+02 −2.1862E+02  8.6334E+00 −1.5964E+02 A18=   4.7583E+01   4.7429E+01 −5.1793E+01  1.0556E+02 A20= — —   1.9667E+01 −2.9331E+01

In the 6th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 6th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 11 and Table 12as the following values and satisfy the following conditions:

6th Embodiment f [mm] 0.95 CT2/CT3 0.81 Fno 2.04 Td/BL 2.86 HFOV [deg.]51.0 (R1 + R2)/(R1 − R2) 0.44 V1/N1 36.30 f/R1 −0.32 V2/N2 36.26 f/R8−1.35 V3/N3 36.26 R7/f + R8/f −1.07 V4/N4 11.65 Y42/Y11 1.46 CT1/T120.81 Yc11/f 0.20 CT1/CT2 0.31 Yc42/f 0.69 T12/(T23 + T34) 3.14 — —

7th Embodiment

FIG. 13 is a schematic view of an optical lens assembly and an imagesensor of an electronic device according to the 7th embodiment of thepresent disclosure. FIG. 14 shows, in order from left to right,spherical aberration curves, astigmatic field curves and a distortioncurve of the image capturing unit according to the 7th embodiment. InFIG. 13, the image capturing unit includes the optical lens assembly(its reference numeral is omitted) of the present disclosure and animage sensor 770. The optical lens assembly includes, in order from anouter side to an inner side, a first lens element 710, an aperture stop700, a second lens element 720, a stop 701, a third lens element 730, afourth lens element 740, an IR-cut filter 750 and an image surface 760.The optical lens assembly includes four lens elements (710, 720, 730 and740) with no additional lens element disposed between each of theadjacent four lens elements.

The first lens element 710 with negative refractive power has anouter-side surface 711 being concave in a paraxial region thereof and aninner-side surface 712 being concave in a paraxial region thereof. Thefirst lens element 710 is made of plastic material and has theouter-side surface 711 and the inner-side surface 712 being bothaspheric. The outer-side surface 711 of the first lens element 710 hasat least one convex critical point in an off-axis region thereof.

The second lens element 720 with positive refractive power has anouter-side surface 721 being concave in a paraxial region thereof and aninner-side surface 722 being convex in a paraxial region thereof. Thesecond lens element 720 is made of plastic material and has theouter-side surface 721 and the inner-side surface 722 being bothaspheric. The outer-side surface 721 of the second lens element 720 hasat least one convex critical point in an off-axis region thereof.

The third lens element 730 with positive refractive power has anouter-side surface 731 being convex in a paraxial region thereof and aninner-side surface 732 being convex in a paraxial region thereof. Thethird lens element 730 is made of plastic material and has theouter-side surface 731 and the inner-side surface 732 being bothaspheric.

The fourth lens element 740 with negative refractive power has anouter-side surface 741 being concave in a paraxial region thereof and aninner-side surface 742 being convex in a paraxial region thereof. Thefourth lens element 740 is made of plastic material and has theouter-side surface 741 and the inner-side surface 742 being bothaspheric. The inner-side surface 742 of the fourth lens element 740 hasat least one concave critical point in an off-axis region thereof.

The IR-cut filter 750 is made of glass material and located between thefourth lens element 740 and the image surface 760, and will not affectthe focal length of the optical lens assembly. The image sensor 770 isdisposed on or near the image surface 760 of the optical lens assembly.

The detailed optical data of the 7th embodiment are shown in Table 13and the aspheric surface data are shown in Table 14 below.

TABLE 13 7th Embodiment f = 0.95 mm, Fno = 2.04, HFOV = 51.0 deg. Sur-face Curvature Thick- Mate- Abbe Focal # Radius ness rial Index # Length0 Object Plano 400.000 1 Lens 1 −1.395 (ASP)   0.253 Plastic 1.545 56.1−1.70 2  2.955 (ASP)   0.168 3 Ape. Plano   0.112 Stop 4 Lens 2 −3.351(ASP)   0.809 Plastic 1.544 56.0 2.53 5 −1.057 (ASP)  −0.203 6 StopPlano   0.233 7 Lens 3  1.224 (ASP)   0.990 Plastic 1.544 56.0 0.72 8−0.408 (ASP)   0.075 9 Lens 4 −0.291 (ASP)   0.441 Plastic 1.669 19.4−1.56 10 −0.648 (ASP)   0.430 11 IR-Cut Plano   0.210 Glass 1.517 64.2Filter 12 Plano   0.329 13 Image Plano   0.000 Note: Referencewavelength is 587.6 nm (d-line). An effective radius of the stop 701(Surface 6) is 0.614 mm.

TABLE 14 Aspheric Coefficients Surface # 1 2 4 5 k= −7.3258E+01  0.0000E+00   0.0000E+00   0.0000E+00 A4=   8.8403E−01   4.4739E+00  9.1663E−01 −1.1295E+00 A6=   4.7153E+00   1.7968E+01   2.6656E+00  1.0260E+01 A8= −4.9595E+01 −5.7581E+02 −1.3068E+01 −5.1203E+01 A10=  2.2657E+02   8.0448E+03 −2.1192E+01   1.4509E+02 A12= −5.5170E+02−6.2731E+04 — −2.1583E+02 A14=   6.9765E+02   3.8961E+05 —   1.2868E+02A16= −3.6117E+02 −1.1506E+06 — — Surface # 7 8 9 10 k= −2.0176E+01−4.6797E+00 −2.3712E+00 −9.2305E−01 A4=   1.6627E−01 −2.0211E+00−1.9775E−01   1.1977E+00 A6=   3.6505E+00   1.6040E+01   6.6611E+00  8.8510E−02 A8= −2.6797E+01 −7.3484E+01 −3.4205E+01 −3.0662E+00 A10=  9.8058E+01   1.8966E+02   6.3784E+01   5.9913E+00 A12= −2.1525E+02−2.7274E+02   3.1014E+01 −8.8102E+00 A14=   2.7840E+02   1.9694E+02−3.2797E+02   2.4985E+01 A16= −1.9130E+02 −4.3262E+01   5.5774E+02−5.2214E+01 A18=   5.2157E+01 −1.1814E+01 −4.1361E+02   4.9957E+01 A20=— —   1.1716E+02 −1.7442E+01

In the 7th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 7th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 13 and Table 14as the following values and satisfy the following conditions:

7th Embodiment f [mm] 0.95 CT2/CT3 0.82 Fno 2.04 Td/BL 2.97 HFOV [deg.]51.0 (R1 + R2)/(R1 − R2) −0.36 V1/N1 36.30 f/R1 −0.68 V2/N2 36.26 f/R8−1.46 V3/N3 36.26 R7/f + R8/f −0.99 V4/N4 11.65 Y42/Y11 1.42 CT1/T120.90 Yc11/f 0.31 CT1/CT2 0.31 Yc42/f 0.72 T12/(T23 + T34) 2.67 — —

8th Embodiment

FIG. 15 is a schematic view of an optical lens assembly and an imagesensor of an electronic device according to the 8th embodiment of thepresent disclosure. FIG. 16 shows, in order from left to right,spherical aberration curves, astigmatic field curves and a distortioncurve of the image capturing unit according to the 8th embodiment. InFIG. 15, the image capturing unit includes the optical lens assembly(its reference numeral is omitted) of the present disclosure and animage sensor 870. The optical lens assembly includes, in order from anouter side to an inner side, a first lens element 810, an aperture stop800, a second lens element 820, a stop 801, a third lens element 830, afourth lens element 840, an IR-cut filter 850 and an image surface 860.The optical lens assembly includes four lens elements (810, 820, 830 and840) with no additional lens element disposed between each of theadjacent four lens elements.

The first lens element 810 with negative refractive power has anouter-side surface 811 being concave in a paraxial region thereof and aninner-side surface 812 being concave in a paraxial region thereof. Thefirst lens element 810 is made of plastic material and has theouter-side surface 811 and the inner-side surface 812 being bothaspheric. The outer-side surface 811 of the first lens element 810 hasat least one convex critical point in an off-axis region thereof.

The second lens element 820 with positive refractive power has anouter-side surface 821 being concave in a paraxial region thereof and aninner-side surface 822 being convex in a paraxial region thereof. Thesecond lens element 820 is made of plastic material and has theouter-side surface 821 and the inner-side surface 822 being bothaspheric. The outer-side surface 821 of the second lens element 820 hasat least one convex critical point in an off-axis region thereof.

The third lens element 830 with positive refractive power has anouter-side surface 831 being convex in a paraxial region thereof and aninner-side surface 832 being convex in a paraxial region thereof. Thethird lens element 830 is made of plastic material and has theouter-side surface 831 and the inner-side surface 832 being bothaspheric.

The fourth lens element 840 with negative refractive power has anouter-side surface 841 being concave in a paraxial region thereof and aninner-side surface 842 being convex in a paraxial region thereof. Thefourth lens element 840 is made of plastic material and has theouter-side surface 841 and the inner-side surface 842 being bothaspheric. The inner-side surface 842 of the fourth lens element 840 hasat least one concave critical point in an off-axis region thereof.

The IR-cut filter 850 is made of glass material and located between thefourth lens element 840 and the image surface 860, and will not affectthe focal length of the optical lens assembly. The image sensor 870 isdisposed on or near the image surface 860 of the optical lens assembly.

The detailed optical data of the 8th embodiment are shown in Table 15and the aspheric surface data are shown in Table 16 below.

TABLE 15 8th Embodiment f = 0.95 mm, Fno = 2.04, HFOV = 51.0 deg. Sur-face Curvature Thick- Mate- Abbe Focal # Radius ness rial Index # Length0 Object Plano 400.000 1 Lens 1 −1.415 (ASP)   0.250 Plastic 1.545 56.1 1.61 2  2.433 (ASP)   0.186 3 Ape. Plano   0.113 Stop 4 Lens 2 −3.532(ASP)   0.779 Plastic 1.544 56.0 2.08 5 −0.924 (ASP)  −0.174 6 StopPlano   0.204 7 Lens 3  1.359 (ASP)   0.950 Plastic 1.544 56.0 0.84 8−0.518 (ASP)   0.070 9 Lens 4 −0.363 (ASP)   0.483 Plastic 1.669 19.4 2.31 10 −0.728 (ASP)   0.430 11 IR-Cut Plano   0.210 Glass 1.517 64.2 —Filter 12 Plano   0.357 13 Image Plano   0.000 Note: Referencewavelength is 587.6 nm (d-line). An effective radius of the stop 801(Surface 6) is 0.601 mm.

TABLE 16 Aspheric Coefficients Surface # 1 2 4 5 k= −5.7248E+01  0.0000E+00   0.0000E+00   0.0000E+00 A4=   1.5088E+00   2.8247E+00  4.4956E−01 −2.8520E−01 A6= −2.6722E+00   1.9419E+02   1.2842E+01  6.6140E−01 A8=   2.4024E+00 −8.3208E+03 −1.0549E+02   8.9218E+00 A10=  5.9163E+00   1.8750E+05   2.7282E+02 −3.9368E+01 A12= −9.9860E+00−2.3932E+06 —   5.6575E+01 A14= —   1.7304E+07 — −2.5756E+01 A16= —−6.4545E+07 — — A18= —   9.4617E+07 — — Surface # 7 8 9 10 k=−1.2587E+01 −3.4013E+00 −2.3332E+00 −8.3336E−01 A4= −2.6687E−02−8.5110E−01 −9.0789E−01   9.8500E−01 A6=   3.1015E+00 −1.3524E+00  5.7263E+00 −2.0304E+00 A8= −2.2934E+01   3.1512E+01 −1.3653E+01  1.6233E+01 A10=   1.0063E+02 −1.6290E+02   2.0152E+01 −6.6421E+01 A12=−2.6135E+02   4.9335E+02 −2.8182E+01   1.5441E+02 A14=   3.7800E+02−9.5223E+02   2.6936E+01 −2.1849E+02 A16= −2.7555E+02   1.1207E+03  1.1454E+01   1.8516E+02 A18=   7.5661E+01 −7.1675E+02 −4.1903E+01−8.5441E+01 A20= —   1.8836E+02   2.0750E+01   1.6239E+01

In the 8th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 8th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 15 and Table 16as the following values and satisfy the following conditions:

8th Embodiment f [mm] 0.95 CT2/CT3 0.82 Fno 2.04 Td/BL 2.87 HFOV [deg.]51.0 (R1 + R2)/(R1 − R2) −0.26 V1/N1 36.30 f/R1 −0.67 V2/N2 36.26 f/R8−1.30 V3/N3 36.26 R7/f + R8/f −1.15 V4/N4 11.65 Y42/Y11 1.38 CT1/T120.84 Yc11/f 0.30 CT1/CT2 0.32 Yc42/f 0.73 T12/(T23 + T34) 2.99 — —

9th Embodiment

FIG. 17 is a schematic view of an optical lens assembly and an imagesensor of an electronic device according to the 9th embodiment of thepresent disclosure. FIG. 18 shows, in order from left to right,spherical aberration curves, astigmatic field curves and a distortioncurve of the image capturing unit according to the 9th embodiment. InFIG. 17, the image capturing unit includes the optical lens assembly(its reference numeral is omitted) of the present disclosure and animage sensor 970. The optical lens assembly includes, in order from anouter side to an inner side, a first lens element 910, an aperture stop900, a second lens element 920, a third lens element 930, a stop 901, afourth lens element 940, an IR-cut filter 950 and an image surface 960.The optical lens assembly includes four lens elements (910, 920, 930 and940) with no additional lens element disposed between each of theadjacent four lens elements.

The first lens element 910 with negative refractive power has anouter-side surface 911 being concave in a paraxial region thereof and aninner-side surface 912 being concave in a paraxial region thereof. Thefirst lens element 910 is made of plastic material and has theouter-side surface 911 and the inner-side surface 912 being bothaspheric. The outer-side surface 911 of the first lens element 910 hasat least one convex critical point in an off-axis region thereof.

The second lens element 920 with negative refractive power has anouter-side surface 921 being concave in a paraxial region thereof and aninner-side surface 922 being convex in a paraxial region thereof. Thesecond lens element 920 is made of plastic material and has theouter-side surface 921 and the inner-side surface 922 being bothaspheric.

The third lens element 930 with positive refractive power has anouter-side surface 931 being convex in a paraxial region thereof and aninner-side surface 932 being convex in a paraxial region thereof. Thethird lens element 930 is made of plastic material and has theouter-side surface 931 and the inner-side surface 932 being bothaspheric.

The fourth lens element 940 with negative refractive power has anouter-side surface 941 being concave in a paraxial region thereof and aninner-side surface 942 being convex in a paraxial region thereof. Thefourth lens element 940 is made of plastic material and has theouter-side surface 941 and the inner-side surface 942 being bothaspheric. The inner-side surface 942 of the fourth lens element 940 hasat least one concave critical point in an off-axis region thereof.

The IR-cut filter 950 is made of glass material and located between thefourth lens element 940 and the image surface 960, and will not affectthe focal length of the optical lens assembly. The image sensor 970 isdisposed on or near the image surface 960 of the optical lens assembly.

The detailed optical data of the 9th embodiment are shown in Table 17and the aspheric surface data are shown in Table 18 below.

TABLE 17 9th Embodiment f = 0.90 mm, Fno = 1.90, HFOV = 52.5 deg. Sur-face Curvature Thick- Mate- Abbe Focal # Radius ness rial Index # Length0 Object Plano Infinity 1 Lens 1 −5.271 (ASP)  0.268 Plastic 1.570 57.0−1.59 2  1.118 (ASP)  0.201 3 Ape. Plano  0.152 Stop 4 Lens 2 −2.256(ASP)  0.418 Plastic 1.570 57.0 −9.76 5 −4.049 (ASP)  0.109 6 Lens 3 0.640 (ASP)  1.007 Plastic 1.570 57.0 0.67 7 −0.407 (ASP) −0.411 8 StopPlano  0.496 9 Lens 4 −0.256 (ASP)  0.250 Plastic 1.700 17.5 −1.40 10−0.485 (ASP)  0.430 11 IR-Cut Plano  0.110 Glass 1.517 64.2 — Filter 12Plano  0.418 13 Image Plano  0.000 Note: Reference wavelength is 587.6nm (d-line). An effective radius of the stop 901 (Surface 8) is 0.800mm.

TABLE 18 Aspheric Coefficients Surface # 1 2 4 5 k= −8.6280E+01  2.9138E−02   5.1488E−02   2.1986E+00 A4=   2.1226E+00   2.8184E+00−7.7556E−01 −4.6170E+00 A6= −1.1050E+01   5.1123E+01   3.1608E+01  3.5666E+01 A8=   7.6285E+01 −1.3363E+03 −1.1128E+03 −2.4626E+02 A10=−4.2838E+02   9.4641E+03   2.6832E+04   7.3249E+02 A12=   1.7264E+03  2.4177E+05 −4.1124E+05   3.8022E+03 A14= −4.6152E+03 −5.8701E+06  3.9181E+06 −4.7441E+04 A16=   7.6984E+03   5.3070E+07 −2.2342E+07  1.9980E+05 A18= −7.1607E+03 −2.2002E+08   6.9245E+07 −4.0103E+05 A20=  2.8019E+03   3.4231E+08 −8.9048E+07   3.1883E+05 Surface # 6 7 9 10 k=−1.1207E+01 −5.2598E+00 −2.2837E+00 −1.1872E+00 A4=   9.3653E−01−2.8455E+00   1.3408E−01   2.1406E+00 A6= −1.0402E+01   3.5619E+01  1.2302E+01 −2.3561E+00 A8=   7.6095E+01 −2.8880E+02 −1.5162E+02−1.4883E+01 A10= −3.8165E+02   1.3933E+03   8.8700E+02   1.2148E+02 A12=  1.3064E+03 −4.1221E+03 −2.9520E+03 −4.1091E+02 A14= −2.9706E+03  7.5731E+03   5.8718E+03   7.7281E+02 A16=   4.2731E+03 −8.4079E+03−6.8888E+03 −8.4035E+02 A18= −3.5076E+03   5.1465E+03   4.3677E+03  4.9504E+02 A20=   1.2462E+03 −1.3274E+03 −1.1411E+03 −1.2228E+02

In the 9th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 9th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 17 and Table 18as the following values and satisfy the following conditions:

9th Embodiment f [mm] 0.90 CT2/CT3 0.42 Fno 1.90 Td/BL 2.60 HFOV [deg.]52.5 (R1 + R2)/(R1 − R2) 0.65 V1/N1 36.31 f/R1 −0.17 V2/N2 36.31 f/R8−1.86 V3/N3 36.31 R7/f + R8/f −0.82 V4/N4 10.29 Y42/Y11 1.29 CT1/T120.76 Yc11/f 0.18 CT1/CT2 0.64 Yc42/f 0.78 T12/(T23 + T34) 1.82 — —

10th Embodiment

FIG. 19 is a schematic view of an optical lens assembly and an imagesensor of an electronic device according to the 10th embodiment of thepresent disclosure. FIG. 20 shows, in order from left to right,spherical aberration curves, astigmatic field curves and a distortioncurve of the image capturing unit according to the 10th embodiment. InFIG. 19, the image capturing unit includes the optical lens assembly(its reference numeral is omitted) of the present disclosure and animage sensor 1070. The optical lens assembly includes, in order from anouter side to an inner side, a first lens element 1010, an aperture stop1000, a second lens element 1020, a stop 1001, a third lens element1030, a stop 1002, a fourth lens element 1040, an IR-cut filter 1050 andan image surface 1060. The optical lens assembly includes four lenselements (1010, 1020, 1030 and 1040) with no additional lens elementdisposed between each of the adjacent four lens elements.

The first lens element 1010 with negative refractive power has anouter-side surface 1011 being concave in a paraxial region thereof andan inner-side surface 1012 being concave in a paraxial region thereof.The first lens element 1010 is made of plastic material and has theouter-side surface 1011 and the inner-side surface 1012 being bothaspheric. The outer-side surface 1011 of the first lens element 1010 hasat least one convex critical point in an off-axis region thereof.

The second lens element 1020 with negative refractive power has anouter-side surface 1021 being convex in a paraxial region thereof and aninner-side surface 1022 being concave in a paraxial region thereof. Thesecond lens element 1020 is made of plastic material and has theouter-side surface 1021 and the inner-side surface 1022 being bothaspheric.

The third lens element 1030 with positive refractive power has anouter-side surface 1031 being convex in a paraxial region thereof and aninner-side surface 1032 being convex in a paraxial region thereof. Thethird lens element 1030 is made of plastic material and has theouter-side surface 1031 and the inner-side surface 1032 being bothaspheric.

The fourth lens element 1040 with negative refractive power has anouter-side surface 1041 being concave in a paraxial region thereof andan inner-side surface 1042 being convex in a paraxial region thereof.The fourth lens element 1040 is made of plastic material and has theouter-side surface 1041 and the inner-side surface 1042 being bothaspheric. The inner-side surface 1042 of the fourth lens element 1040has at least one concave critical point in an off-axis region thereof.

The IR-cut filter 1050 is made of glass material and located between thefourth lens element 1040 and the image surface 1060, and will not affectthe focal length of the optical lens assembly. The image sensor 1070 isdisposed on or near the image surface 1060 of the optical lens assembly.

The detailed optical data of the 10th embodiment are shown in Table 19and the aspheric surface data are shown in Table 20 below.

TABLE 19 10th Embodiment f = 0.86 mm, Fno = 2.00, HFOV = 53.6 deg. Sur-face Curvature Thick- Mate- Abbe Focal # Radius ness rial Index # Length0 Object Plano Infinity 1 Lens 1 −2.605 (ASP)  0.236 Plastic 1.572 57.0−1.34 2  1.116 (ASP)  0.186 3 Ape. Plano  0.075 Stop 4 Lens 2  4.501(ASP)  0.705 Plastic 1.572 57.0 −3.36 5  1.269 (ASP) −0.032 6 Stop Plano 0.101 7 Lens 3  0.448 (ASP)  0.985 Plastic 1.572 57.0 0.64 8 −0.386(ASP) −0.369 9 Stop Plano  0.454 10 Lens 4 −0.253 (ASP)  0.250 Plastic1.707 17.5 −1.22 11 −0.503 (ASP)  0.430 12 IR-Cut Plano  0.110 Glass1.518 64.2 — Filter 13 Plano  0.314 14 Image Plano  0.000 Note:Reference wavelength is 587.6 nm (d-line). An effective radius of thestop 1001 (Surface 6) is 0.608 mm. An effective radius of the stop 1002(Surface 9) is 0.805 mm.

TABLE 20 Aspheric Coefficients Surface # 1 2 4 5 k= −9.9000E+01  6.0087E+00   3.8174E+01 −2.3625E−01 A4=   2.9955E+00   4.9655E+00  5.9208E−01 −9.5693E+00 A6= −1.9646E+01   3.0586E+01   1.2780E+01  1.1031E+02 A8=   1.6062E+02 −1.4567E+03 −4.2587E+02 −1.1215E+03 A10=−1.0906E+03   2.5579E+04   1.0587E+04   8.2828E+03 A12=   5.4230E+03−1.1938E+05 −1.5943E+05 −4.2019E+04 A14= −1.8295E+04 −1.7116E+06  1.4286E+06   1.4208E+05 A16=   3.9207E+04   2.4912E+07 −7.5220E+06−3.0486E+05 A18= −4.7754E+04 −9.4473E+07   2.1594E+07   3.7472E+05 A20=  2.4955E+04   3.3966E+07 −2.6246E+07 −2.0037E+05 Surface # 7 8 10 11 k=−6.7603E+00 −5.6258E+00 −2.4997E+00 −1.2558E+00 A4= −3.0496E−01−3.3853E+00 −6.1615E−01   2.0840E+00 A6=   2.7104E+00   4.5137E+01  1.8124E+01 −3.6037E+00 A8= −2.0084E+01 −3.7283E+02 −1.8449E+02−5.9603E+00 A10=   6.6826E+01   1.8404E+03   1.0295E+03   9.4810E+01A12= −5.0776E+01 −5.6308E+03 −3.3771E+03 −3.6854E+02 A14= −3.1044E+02  1.0822E+04   6.6921E+03   7.2963E+02 A16=   9.8500E+02 −1.2757E+04−7.9069E+03 −8.0531E+02 A18= −1.1500E+03   8.4524E+03   5.1502E+03  4.7367E+02 A20=   4.9203E+02 −2.4140E+03 −1.4287E+03 −1.1621E+02

In the 10th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 10th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 19 and Table 20as the following values and satisfy the following conditions:

10th Embodiment f [mm] 0.86 CT2/CT3 0.72 Fno 2.00 Td/BL 3.03 HFOV [deg.]53.6 (R1 + R2)/(R1 − R2) 0.40 V1/N1 36.31 f/R1 −0.33 V2/N2 36.31 f/R8−1.71 V3/N3 36.31 R7/f + R8/f −0.88 V4/N4 10.29 Y42/Y11 1.48 CT1/T120.90 Yc11/f 0.22 CT1/CT2 0.33 Yc42/f 0.90 T12/(T23 + T34) 1.69 — —

11th Embodiment

FIG. 21 is a perspective view of an electronic device according to the11th embodiment of the present disclosure.

In this embodiment, an electronic device 10 is a smartphone including animage capturing unit 11, a projection unit 12 and a display unit 13. Theimage capturing unit 11 includes the optical lens assembly disclosed inthe 4th embodiment and an image sensor (their reference numbers areomitted). The projection unit 12 includes a light source (its referencenumber is omitted) emitting, for example, visible light having awavelength range of 400 nm to 750 nm or infrared light having awavelength range of 750 nm to 1600 nm.

The light source of the projection unit 12 can be a laser, asuperluminescent diode (SLED), a micro LED, a resonant cavity lightemitting diode (RCLED), a vertical cavity surface emitting laser (VCSEL)and the like. The light source can be a single light source or multiplelight sources to present good projection quality. In a case that thelight source of the projection unit 12 is a VCSEL, the light source isfavorable for the projection unit 12 to emit high directional light rayshaving low divergence and high intensity. The light source of theprojection unit 12 can project light rays onto a detected object. Inthis embodiment, besides capturing images, the image capturing unit 11can be used as a receiving unit corresponding to the projection unit 12.The light rays from the projection unit 12 are reflected by the detectedobject, then travel into the image capturing unit 11, pass through theoptical lens assembly and finally are imaged on the image sensor.

The projection device 12 may further include a diffractive opticalelement (not shown). The diffractive optical element helps project thelight evenly onto the detected object O, or helps diffract the light toenlarge the projection angle and the projection field. The diffractiveoptical element can be a diffuser, a raster or a combination thereof(but not limited thereto). The diffractive optical element can have amicro structure such as a diffraction grating for scattering the lightand replicating a speckle pattern generated by the scattered light,thereby enlarging the projection angle of the projection device 12.

In this embodiment, the image capturing unit 11 features functions ofoptical imaging and receiving single-wavelength light, and thesingle-wavelength light can be, but not limited to, visible light orinfrared light. The electronic device 10 in FIG. 21 has the imagecapturing unit 11, the projection unit 12 and the display unit 13 on thesame side thereof such that the image capturing unit 11 can beconfigured as a front-facing camera for taking selfies, but the presentdisclosure is not limited thereto.

12th Embodiment

FIG. 22 is a perspective view of an electronic device according to the12th embodiment of the present disclosure. In this embodiment, anelectronic device 20 is a smartphone including an image capturing unit21, a receiving unit 22, a projection unit 23 and a display unit (itsreference number is omitted). The image capturing unit 21 includes theoptical lens assembly disclosed in the 1st embodiment and an imagesensor (their reference numbers are omitted), and the receiving unit 22can include the optical lens assembly disclosed in one of the aboveembodiments. That is, in comparison with the electronic device 10 inFIG. 21, the electronic device 20 is equipped with the image capturingunit 21 and the receiving unit 22 that are functionally independent. Theprojection unit 23 has a configuration the same as that of theprojection unit 12 disclosed in the 11th embodiment, so an explanationin this regard will not be provided again. In this embodiment, the imagecapturing unit 21, the receiving unit 22 and the projection unit 23 areall disposed on one side of the electronic device 20, while the displayunit is disposed on the opposite side of the electronic device 20.

13th Embodiment

FIG. 23 is a perspective view of an electronic device according to the13th embodiment of the present disclosure. In this embodiment, anelectronic device 30 is a smartphone including an image capturing unit31, a projection unit 32 and a display unit (its reference number isomitted). The image capturing unit 31 includes the optical lens assemblydisclosed in the 4th embodiment and an image sensor (their referencenumbers are omitted). The projection unit 32 has a configuration thesame as that of the projection unit 12 disclosed in the 11th embodiment,so an explanation in this regard will not be provided again. Besidescapturing images, the image capturing unit 31 can be used as a receivingunit corresponding to the projection unit 32. In this embodiment, theimage capturing unit 31 and the projection unit 32 are both disposed onone side of the electronic device 30, while the display unit is disposedon the opposite side of the electronic device 30.

The smartphone in this embodiment is only exemplary for showing theimage capturing units including the optical lens assembly of the presentdisclosure installed in an electronic device, and the present disclosureis not limited thereto. The optical lens assembly can be optionallyapplied to systems with a movable focus. Furthermore, the optical lensassembly of the image capturing unit features good capability inaberration corrections and high image quality, and can be applied to 3D(three-dimensional) image capturing applications, in products such asdigital cameras, mobile devices, digital tablets, smart televisions,network surveillance devices, dashboard cameras, vehicle backup cameras,multi-camera devices, image recognition systems, motion sensing inputdevices, wearable devices and other electronic imaging devices.

The foregoing description, for the purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatTABLES 1-20 show different data of the different embodiments; however,the data of the different embodiments are obtained from experiments. Theembodiments were chosen and described in order to best explain theprinciples of the disclosure and its practical applications, to therebyenable others skilled in the art to best utilize the disclosure andvarious embodiments with various modifications as are suited to theparticular use contemplated. The embodiments depicted above and theappended drawings are exemplary and are not intended to be exhaustive orto limit the scope of the present disclosure to the precise formsdisclosed. Many modifications and variations are possible in view of theabove teachings.

What is claimed is:
 1. An electronic device comprising: an optical lensassembly comprising four lens elements, the four lens elements being, inorder from an outer side to an inner side, a first lens element, asecond lens element, a third lens element and a fourth lens element;wherein the second lens element has positive refractive power, a totalnumber of lens elements in the optical lens assembly is four, acurvature radius of an outer-side surface of the second lens element anda curvature radius of an inner-side surface of the second lens elementhave a same sign, a curvature radius of an outer-side surface of thefourth lens element and a curvature radius of an inner-side surface ofthe fourth lens element have a same sign, an axial distance between thethird lens element and the fourth lens element is larger than an axialdistance between the second lens element and the third lens element, theaxial distance between the third lens element and the fourth lenselement is smaller than a central thickness of the first lens element,and a central thickness of the second lens element is larger than acentral thickness of the fourth lens element; wherein an Abbe number ofthe first lens element is V1, an Abbe number of the second lens elementis V2, an Abbe number of the third lens element is V3, an Abbe number ofthe fourth lens element is V4, an Abbe number of the i-th lens elementis Vi, a refractive index of the first lens element is N1, a refractiveindex of the second lens element is N2, a refractive index of the thirdlens element is N3, a refractive index of the fourth lens element is N4,a refractive index of the i-th lens element is Ni, and at least one lenselement of the optical lens assembly satisfies the following condition:8.0<Vi/Ni<12.0, wherein i=1, 2, 3 or
 4. 2. The electronic device ofclaim 1, wherein the first lens element has an inner-side surface beingconcave in a paraxial region thereof.
 3. The electronic device of claim1, wherein the third lens element has an outer-side surface being convexin a paraxial region thereof.
 4. The electronic device of claim 1,wherein the optical lens assembly further comprises an aperture stopdisposed on the outer side of the second lens element.
 5. The electronicdevice of claim 1, wherein outer-side surfaces and inner-side surfacesof the second lens element, the third lens element and the fourth lenselement are aspheric.
 6. The electronic device of claim 1, wherein thesecond lens element, the third lens element and the fourth lens elementare made of plastic material.
 7. The electronic device of claim 1,wherein at least one of an outer-side surface and an inner-side surfaceof at least one lens element of the optical lens assembly has at leastone inflection point.
 8. The electronic device of claim 1, wherein acurvature radius of an outer-side surface of the first lens element isR1, a curvature radius of an inner-side surface of the first lenselement is R2, and the following condition is satisfied:(R1+R2)/(R1−R2)<0.70.
 9. The electronic device of claim 8, wherein thecurvature radius of the outer-side surface of the first lens element isR1, the curvature radius of the inner-side surface of the first lenselement is R2, and the following condition is satisfied:(R1+R2)/(R1−R2)<0.40.
 10. The electronic device of claim 9, wherein thecurvature radius of the outer-side surface of the first lens element isR1, the curvature radius of the inner-side surface of the first lenselement is R2, and the following condition is satisfied:(R1+R2)/(R1−R2)≤−0.36.
 11. The electronic device of claim 1, wherein theAbbe number of the first lens element is V1, the Abbe number of thesecond lens element is V2, the Abbe number of the third lens element isV3, the Abbe number of the fourth lens element is V4, the Abbe number ofthe i-th lens element is Vi, the refractive index of the first lenselement is N1, the refractive index of the second lens element is N2,the refractive index of the third lens element is N3, the refractiveindex of the fourth lens element is N4, the refractive index of the i-thlens element is Ni, and at least one lens element of the optical lensassembly satisfies the following condition:8.0<Vi/Ni≤11.65, wherein i=1, 2, 3 or
 4. 12. The electronic device ofclaim 1, wherein an absolute value of a curvature radius of anouter-side surface of the first lens element is smaller than an absolutevalue of a curvature radius of an inner-side surface of the first lenselement.
 13. The electronic device of claim 1, wherein a curvatureradius of an inner-side surface of the third lens element and acurvature radius of the outer-side surface of the fourth lens elementhave a same sign.
 14. The electronic device of claim 1, wherein a focallength of the third lens element and a focal length of the fourth lenselement have different signs.
 15. The electronic device of claim 1,wherein a focal length of the first lens element and a focal length ofthe fourth lens element have a same sign.